The proposed Tappan Zee Bridge replacement would take just over five years to construct and would require dredging of about 951,000 cubic yards.

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The money set aside to restore wetlands, channels and oyster beds in the Hudson River, as well as study the endangered shortnose and Atlantic sturgeon, falls well short of what was spent on a major bridge project to the south, an environmental watchdog group said Wednesday.

The replacement of a drawbridge carrying Interstates 95 and 495 over the Potomac River near Washington, D.C., came with $50 million to restore habitat there, which makes the $8 million mitigation fund for the new Tappan Zee Bridge appear paltry, Ossining-based Riverkeeper said. It wants more than $50 million for mitigation here.

In comments released Wednesday, Riverkeeper also faulted several aspects of the state Department of Environmental Conservation’s proposed permit governing the $3.9 billion project’s impacts on the Hudson River. The group asked for a hearing to address the issues.

“Our goal is to have a strong permit and a proper amount of mitigation,” Riverkeeper attorney Phillip Musegaas said. “Our goal is to work through our concerns with the state.”

The state has no regulation allowing it to suspend water pollution laws to make way for the sediment and other contaminants stirred up in the Hudson during construction, Musegaas said.

It needs a detailed plan that includes more sampling with moored and floating instruments as well as inspections from boats, he said. And a monitoring plan for sturgeon needs to be in place when construction starts, he added, which is expected to be this year.

A Thruway spokesman didn’t specifically address Riverkeeper’s issues but reiterated that the project involves “substantially less dredging” than initially contemplated.

“The environmental mitigation measures for the ... project include stringent requirements and cutting edge construction techniques to protect the Hudson River, its fish, and other aquatic life. Independent experts will be on site during construction to make sure all permit requirements are enforced,” spokesman Dan Weiller said in an email.